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1 | // Boost.Geometry |
2 | ||
92f5a8d4 | 3 | // Copyright (c) 2016, 2018 Oracle and/or its affiliates. |
7c673cae FG |
4 | |
5 | // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle | |
6 | ||
7 | // Use, modification and distribution is subject to the Boost Software License, | |
8 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
9 | // http://www.boost.org/LICENSE_1_0.txt) | |
10 | ||
b32b8144 FG |
11 | #ifndef BOOST_GEOMETRY_FORMULAS_ECCENCRICITY_SQR_HPP |
12 | #define BOOST_GEOMETRY_FORMULAS_ECCENCRICITY_SQR_HPP | |
7c673cae | 13 | |
92f5a8d4 TL |
14 | #include <boost/geometry/algorithms/not_implemented.hpp> |
15 | ||
7c673cae FG |
16 | #include <boost/geometry/core/radius.hpp> |
17 | #include <boost/geometry/core/tag.hpp> | |
18 | #include <boost/geometry/core/tags.hpp> | |
19 | ||
92f5a8d4 | 20 | #include <boost/geometry/util/math.hpp> |
7c673cae FG |
21 | |
22 | namespace boost { namespace geometry | |
23 | { | |
24 | ||
25 | #ifndef DOXYGEN_NO_DISPATCH | |
b32b8144 | 26 | namespace formula_dispatch |
7c673cae FG |
27 | { |
28 | ||
29 | template <typename ResultType, typename Geometry, typename Tag = typename tag<Geometry>::type> | |
b32b8144 | 30 | struct eccentricity_sqr |
7c673cae FG |
31 | : not_implemented<Tag> |
32 | {}; | |
33 | ||
34 | template <typename ResultType, typename Geometry> | |
b32b8144 | 35 | struct eccentricity_sqr<ResultType, Geometry, srs_sphere_tag> |
7c673cae FG |
36 | { |
37 | static inline ResultType apply(Geometry const& /*geometry*/) | |
38 | { | |
39 | return ResultType(0); | |
40 | } | |
41 | }; | |
42 | ||
43 | template <typename ResultType, typename Geometry> | |
b32b8144 | 44 | struct eccentricity_sqr<ResultType, Geometry, srs_spheroid_tag> |
7c673cae FG |
45 | { |
46 | static inline ResultType apply(Geometry const& geometry) | |
47 | { | |
b32b8144 FG |
48 | // 1 - (b / a)^2 |
49 | return ResultType(1) - math::sqr(ResultType(get_radius<2>(geometry)) | |
50 | / ResultType(get_radius<0>(geometry))); | |
7c673cae FG |
51 | } |
52 | }; | |
53 | ||
b32b8144 | 54 | } // namespace formula_dispatch |
7c673cae FG |
55 | #endif // DOXYGEN_NO_DISPATCH |
56 | ||
57 | #ifndef DOXYGEN_NO_DETAIL | |
b32b8144 | 58 | namespace formula |
7c673cae FG |
59 | { |
60 | ||
61 | template <typename ResultType, typename Geometry> | |
b32b8144 | 62 | ResultType eccentricity_sqr(Geometry const& geometry) |
7c673cae | 63 | { |
b32b8144 | 64 | return formula_dispatch::eccentricity_sqr<ResultType, Geometry>::apply(geometry); |
7c673cae FG |
65 | } |
66 | ||
b32b8144 | 67 | } // namespace formula |
7c673cae FG |
68 | #endif // DOXYGEN_NO_DETAIL |
69 | ||
70 | }} // namespace boost::geometry | |
71 | ||
b32b8144 | 72 | #endif // BOOST_GEOMETRY_FORMULAS_ECCENCRICITY_SQR_HPP |